To be honest, I am not very happy with addition of a new special class. Imagine that the PEP 544 will be accepted (and I hope so). Then we would have, abstract classes, abstract base classes, and protocols. I think users will be overwhelmed by having three similar concepts instead of one.
I think we still could squeeze a lot of performance from good old ABCs by optimizing various parts and reimplementing some parts in C. In fact, my desire to optimize and rewrite ABCMeta in C is partially due to reluctance to add yet another concept of "abstractness". -- Ivan
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